US 11,007,687 B2Granted

Polyurethane injection system and method

AssigneeLegacy Foam, LLC

InventorBruce M. Okkema

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Abstract

A system and method to dispense, mix, and inject liquids and force them into a vented investment pattern mold cavity comprises a source of raw materials in fluid communication with an injection unit for metering and delivering the raw materials. A mixing and injection head receives and mixes the metered raw materials. A movable molding cart upon which an investment pattern mold is mounted is disposed adjacent the injection unit and proximate the mixing and injection head. The movable molding cart includes a fill cup that may be engaged by the mixing and injection head. A displaceable gating tray provides fluid communication with the fill cup and a sprue aligned with an investment port on a lower portion of the investment pattern mold. The system also includes a digital computer control by which the injection process may be controlled.

Claims50

Dependent claims

An injection system for molding molded articles within a mold cavity of a mold, the injection system comprising:

an injection unit comprising a mixing and injection head further comprising a vertical mixing chamber, an inlet to the vertical mixing chamber for a raw material of an injectable product, and an injection nozzle at a lower end of the vertical mixing chamber for the injectable product;
a metering pump for delivering a predetermined quantity of the raw material to the vertical mixing chamber;
and
a movable molding cart upon which the mold is mounted, the movable molding cart comprising a displaceable gating tray disposed within a channel of the moveable molding cart, a fill cup disposed on the displaceable gating tray, and a closable sprue in alignment with the mold cavity;
wherein when the movable molding cart is in a first position proximate the mixing and injection head, the fill cup may be placed in vertical alignment with the injection nozzle of the vertical mixing chamber and the closable sprue is placed in an open position so that the injectable product may be injected into an investment port of the mold cavity.

2 more elements

An injection system to dispense, mix, and inject liquids into a vented investment pattern mold cavity of an investment pattern mold, the injection system comprising:

a source of raw materials in fluid communication with an injection unit for metering and delivering the raw materials;
a mixing and injection head mounted proximate an edge of the injection unit that receives and mixes the metered raw materials;
and
a movable molding cart upon which the investment pattern mold is mounted disposed adjacent the injection unit and proximate the mixing and injection head, the movable molding cart further comprising a displaceable gating tray disposed within a channel of the movable molding cart, a fill cup disposed on the displaceable gating tray and mounted proximate an edge of an upper platform of the movable molding cart, and a closable sprue in alignment with the investment mold cavity, which fill cup may be controlled by a position of the mixing and injection head, an actuator, or manually so as to allow for an injectable product to be injected into an investment mold port of the investment mold cavity via the fill cup and sprue.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/145,407Filed 28 Sep 2018 · us provisional application
Priority: 2 Oct 2017
Published: US 2019/0099926 A14 Apr 2019
Granted: 18 May 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification26 codes

B29C 44/425
Details of machines: valve or nozzle constructions; Details of injection devices
B29B 7/00
Mixing
B29B 7/401
With single shaft: having a casing closely surrounding the rotor, e.g. with a plunger for feeding the material
B29B 7/402
With single shaft: using a rotor-stator system with intermeshing elements, e.g. teeth